From the classical antenna theory, characteristics of receiving can be analyzed by Thévenin equivalent circuit, but this circuit has limitations in determining dissipated power for a lossy antenna. In paper, Poynting streamline method is used to directly model as receiver where flow field energy around represented generating streamlines vector field. This provides better understanding true phys...

Microstrip antennas are low in profile and light in weight and they are now developed for many applications. The main difficulty of the microstrip antenna is its narrow bandwidth. Several modern applications like satellite communications, remote sensing and multi-function radar systems will find it useful if there is a dual band antenna operating from a single aperture. Some applications requir...

Cognitive radio (CR) is a very promising technology of future wireless communications that has greater demands for antenna designs. One practical antenna is a reconfigurable antenna that has dual mode operations, i.e. scanning a free RF spectrum and transmitting or receiving information data via a CR link. One possible compact antenna configuration is based on the dipole or monopole that has na...

0278-6648/03/$17.00 © 2003 IEEE IEEE POTENTIALS Antenna arrays are individual radiating elements combined so that they function and perform like a single large antenna. Besides high radiating beam directionality, antenna arrays offer the capability to scan the main beam and control sidelobe radiation elect r o n i c a l l y . Retrodirective antenna arrays, as the name suggests, have a special f...

In this paper, a novel CPW-fed antenna is presented for UWB applications. The antenna mainly comprises of a simple circular patch and a modified ground plane. The inclusion of two novel symmetrical rectangular slots with inner area of 3×2.8 mm2 to the top corners of the antenna creates a new path for the current and consequently leads to the bandwidth enhancement. A rectangular stub is also ado...

In this study, a radiation pattern reconfigurable microstrip antenna is designed and fabricated. The antenna’s radiation pattern is directed in 9 different angles by employing a radiating patch and embedding complementary split ring resonators (CSRR) on the ground plane. The radiating patch is of circular shape, while for CSRR elements both circular and rectangular shapes are investigated. The ...

Advanced satellite communications system needs large-scale satellite-borne antenna with a function of beam steering and/or multiple spot beams to cover wide service area with high antenna gain. Although phased array antenna is very useful for the feed for the large reflector to satisfy the requirements above, it generally causes increase in the equipment weight, feed loss, and complexity in bea...